Belt-tightening device.



L. L. & E. c. FILSTRUP I BELT TIGHTENING DEVICE.

APPLICATION FILED JUNE 3,1910.

Patent-6d May 9, 1916.

8 SHEETSSHEET I V f go 6 ZZZ l I 7 33 -37 L. L. & E. c. FILSTRU P.

BELT TIGHTENING DEVICE. APPLICATION FILED JUNE 3, i910.

Patented May 9,1916.

8 SHEETSSHEET 2.

L; L. & E. c. FILSTRUP.

BELT TIGHTENING DEVICE.

APPLICATION FILED JUNE 3,1910.

Patented May 9, 1916.

a SHEETS-SHEET a.

L. L. & E. C. FILSTRUP. BELT TIGHTENING DEVICE.

APPLICATION FILED JUNE 3. I910.

Patented May 9,1916.

8 SHEETS-SHEET 4- THE COLUMBIA PLANOGRAPH CD., WASHINGTON D- C.

L.-L. & E. 'C. FILSTRUP.

BELT TIGHTENING DEVICE.

APPLICATION FILED JUNE 3, 1910.

Patented May 9,1916.

8 SHEETS-SHEET 5- 'L. L. & EC. FILSTRUP.

BELT TIGHTENING DEVICE.

APPLICATION FILED JUNE 3. 1910.

Pzitented May 9,1916.

8 SHEETS--SHEET 6- L. L. & E. C. FILSTRUP. BELT TIGHTENING DEVICE.APPLICATION FILED JUNE 3,1910.

Patented May 9,1916.

8 SHEETS-SHEET 7 THE COLUMBIA PLANDGRAPH C0,. WASHINGTON, D. c.

L. L. & E. C. FILSTRUP. BELT TIGHTENING DEVICE. APPLICATION FILED JUNE3. 1910.

Patented May 9,1916.

8 SHEETSSHEET 8.

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THE COLUMBIA PLANUURAPH ,CD-, WASHINGTON, B. C.

LABS L. FILSTRU]? AND EDDIE C. FILSTRUP, OF BENTON HARBOR, MICHIGAN.

BELT-TIGHTENING DEVICE.

Specification of Letters Patent.

Patented May 9, 1316.

Application filed June 3, 1910. Serial No. 564,886.

To all whom/"it may concern:

Be it known that we, LABS L. FILSTRUP and EDDIE C. FILs'rRUr, citizensof the United States of America, and residents of Benton Harbor,Michigan, have invented a certain new and useful Improvement inBelt-Tightening Devices, of which the following is a specification.

Our invention relates to improvements in saw sharpening machines, moreespecially in automatic belt tightening and adjusting devices for use insuch machines, and has for its object the production of a device bymeans of which a belt may be kept tight and true, regardless of theshifting of position of one of the pulleys.

A further object is the production of a device especially well adaptedfor use in connection with saw sharpening machines in which the positionof the driving pulley for the grinding wheel is constantly shifting.

A further object is the production of improved mechanism for use inconnection with saw sharpening machines that can be readily attached totypes of machines now in use without material alteration to suchmachines.

These and such other objects as may hereinafter appear, are attained byour device, embodiments of which are illustrated in the accompanyingdrawings, in which: 7

Figure 1 represents a side elevation of a saw sharpening machineembodying our improvements. Fig. 2 represents a rear elevation of themachine shown in Fig. 1. Fig. 3 represents a .top plan View of saidmachine. Fig. 4 represents an enlarged side elevation of a modified formof our device. Fig. 5 represents a top plan view of Fig. 4. Fig. 6represents an end view of Fig. 4. Fig. 7 represents an enlarged sideelevation of another form of our device. Fig. 8 represents a top planview of Fig. 7. Fig. 9 represents an end view of Fig. 7. Fig. 10represents an enlarged side elevation of still another form of ourdevice. Fig. 11. represents a top plan view of Fig. 10. Fig. 12represents an end view of Fig. 10. Fig. 13 represents a side elevationof a modification of a portion of our device. Fig. 14 represents a topplan view of Fig. 13. Fig. lei-represents an end view of Fig. 1. Fig. 16shows a side elevation of another form of our device. Fig. 17 representsa top plan vlew of Fig. 16. Fig. 18 is an end view of Fig. 16.

Like numerals of reference indicate like parts in the several figures ofthe drawings.

Referring now to the drawings, and particularly to Fig. 1. The numeral19 refers to the frame of a saw sharpening machine on the front of whichis mounted a gate frame support 20. A gate frame 21 is movablymounted insaid support; a gate 22 is slidably mounted in the gate frame. A shaftor arbor 23 on which is mounted an arbor pulley 24 is positioned withinthe gate, and on the end of the wiper 23 is mounted the grinding wheel25.

In the operation of the machine the grinding wheel 25 is brought incontact with the teeth of a saw (not shown) resting in a guide orsupport 26, and is held in position by means of a spring hasp 27. Theangular position of the grinding wheel is varied by moving the gateframe about the arc of a circle the center of which is the point ofcontact of the grinding wheel on the tooth of ,the saw, while thevertical adjustment of the grinding wheel is accomplished by themovement of the gate within .the gate frame. v

Power is transmitted to the machine through the belt 28 over the drivepulley 29, and the belt 30 over the pulleys 31-32. The power to operatethe grinding wheel is transmitted through the belt 33 passing over themain pulley 34, the movable pulley 35, the arbor pulley 24 on thegrinding wheel arbor and the idler 36.

Referring now more especially to Fig.1: On the rear of the frame 19 ismounted a supporting casting 37 having a bore in its upper end withinwhich is mounted the pulley supporting shaft 38. The spindle 39 of theidler 36 is also mounted on this casting. The pulley 35 is mounted onthe spindle 40 supported in the journal casting 41, slidably mounted onthe shaft 38. A spring 42 is slipped over the shaft between the jour nalcasting and the supporting casting, and adapted to bearagainst a slidingcollar 43 also mounted on the shaft and through the medium of which thetension of the spring may be adjusted. The angular adjustment 'ing anarm rt.

of the pulley is effected by turning the bearing ll on the shaft 88.

The journal bearing casting elhis extended downwardly below the shaft,form- A yoke 15 isloosely mounted on a pin 46 passing through the arm4:45 the lower end of the arm being positioned between the two arms 45and 45 of the yoke 45 A- thumb-screw passes through the end of the arm45 engaging the lower end of the arm 44:. arm s5? is a roller *7 restingagainst a rod or shaft48 also mounted on the support 37, the pressure onthe pulley 35 holding the roller-against the shaft 48.

TVhen by reason of the shifting of posi 'tion of the grinding wheelarbor it is advisable to change the inclination of the spindlelO, it issimply necessary to turn the thumb-screw 46 thus raising or lowering theend of the spindle as the roller 47 always remains in contact with theshaft or bar 48. It will also be noted that thespmdles 39 and l0 areextended, thus permitting the pulleys to slidein and out, as occasionmay require. It will thus be seen that by adjusting the spring 42 to theV proper tension, allvariations in thelength of the belt caused'eitherby the stretching of the belt itself or by changes in the position ofparts ofthe' machine are automatically taken care of and the belt iskept run ning true by a combination of operations that is the manualadjustment of the angle er; the spindle 40 and the automatic movement ofthe pulley 35 on the spindle. It

will thus be noted that by the use of our imn'o'ved means the belt is heat taut'and true, 1 V

regardless of range of movement of the grinding wheel.

Referringnow to Figs; 4 5 and In this form the spring 42 is dispensedwith.

. the end of the shaft 38 we mount a grooved pulley 48%? and on an arm49 secured' to the casting 37 is mounted a second grooved pulley 50. Onone end of a cord .51 secured a hook '51? on the slidinglymountedjburnal casting -1t1, the cord passingover the pulleys s8? and50, and having a werght'52 attached to its lower end. The weight s'madeup of series of small disks "ori weights 52*, as by removing or addingany number ofthe disks the pull on the castingdl necessary to counteractthat of the belt may be accurately adjusted.

[In fthe modification shown in Figs. 7, '8

, and9, we dispense'with the weight 5 and pulley 50, and in'place of thecord 51 we provide a spring '53 passing overthe grooved pulley, one endbeing secured to the support 51 and the other to a similar support 52*mounted on the casting 37. In this form a the tension of the-spring 53is substituted for the'pull of the weight. M

Referring now to Figs, 10, 11 and 12 On the lower end of the an arm 49"is mounted on the casting 37 extending beyond the limit of travel of thepulley 35. On the end of this arm is mounted a bell-crank lever 54:. Theupper arm is provided with a slot 55, and a pin 56 on the casting l1 ispositioned to slide within the slot. On the outer end of the lever 54-is mounted a sliding weight 56, the end 57 of the lever being extendedto form a support for the weight and a set screw 58 being provided. tohold the weight in any desired position on the support 57. It will thusbe seen that any tendency of the pulley 35 to slide toward the guidingwheel will be resisted by the weight 5G acting through the bellcra-nklever and by adjusting the size and position of the weight on the end 57any looseness in the belt is taken up by forcing the bearing castingel-l outwardly on the bar 38.

Referring now to Figs. 13, 14 and 15 in which we have illustrated meansfor regu lating the inclination of the spindle 40: This spindle isextended beyond the bearing ll forming a weight supporting arm 40 onwhich is mounted a weight 5.) hold in position by means of a set-screw60. The bearing casting 41 is provided with an upwardly projecting lugor stop 61 sliding within a channel 62 in the shaft or bar '38, thusconfining the rocking motion of the bearing on the shaft within certaindefined limits. As the inclination of the grinding wheel arbor changesthe position of the pulley on the spindle changes and the position ofthe weight is shifted to accommodate the conditions in the case.

For the vertical movement of the saw support a guide 26 is slidablymounted on a guiding frame 62 on the front frame of the machine and ismoved vertically by means of alever 63, one end of which may be attachedat 64 in any suitable manner to the guide. The lever 63 is pivotallymounted at a' point intermediate of its length. A screw 66 is mounted ina threaded support 67 (Figs. 1, 2 and on the top of the frame 19 and ispivotally connected to the other end of the lever at 68. It is thusapparent that by turning the handle (39 on the top of the screw themovement of the lever raises or lowers the guide 26 in its frame (32,thus providing a simple means for adjusting the position of the sawwhile it is being oper ated upon.

Referring to Figs. 16, 17 and 18: It is there shown another modificationof our device, in which the idler pulleys and 36 are stationary withrespect to the frame 37 upon which they are mounted, while this frame ismounted upon a gate 70, and is free to move therein. The pulley 71 isattached to the end of this gate, and a cord and weight 72 passingthrough this pulley is so attached to the frame 37 as to maintain thetension of the belt in a manner which is clearly evident from aninspection of these figures. It will be noted that in this modificationthe tension upon the belt is maintained through both of the pulleysinstead of but one. It is obvious that in place of the weight 72 thistension can bemaintained by means .of a spring, these being obviousequivalents.

e claim:

1. In a machine of the class described, the combination with. a frame,an arbor adjustably mounted in said frame so that its position may beshifted, a belt for transmitting power to and actuating said arbor,means including a movable pulley for regulating the tension of saidbelt, and separate means for regulating the angular position of saidpulley about an axis at right angles to the axis of the pulleyregardless ofthe changed position of said arbor.

lac

2. In a machine of the class described, the combination with a frame, anarbor adjustably mounted in said frame so that its position may beadjusted angularly with respect to. said frame, an arbor pulley, a beltfor transmitting power to said arbor pulley, a plurality of fixedpulleys over which said belt passes, means including a movable pulleyover which said belt passes, for regulating the tension of said belt,and means for regulating the angular position of said movable pulleywith respect to said fixed pulleys regardless of the relative positionof 35] said arbor pulley.

3. In a machine of the class described, the combination with a frame, anarbor adjustably mountedyin said frame adapted to be adjusted angularlywith respect to said frame, power-transmitting means for actuating saidarbor, said means comprising a plurality of fixed pulleys, a movablepulley having a substantially cylindrical periphery, an arbor pulley, abelt passing over said pulleys, and means for shifting said movablepulley with respect to said arbor pulley.

l. In a machine of the class described, the combination with a frame, anarbor adjustably mounted in said frame so that its position may beangularly adjusted with respect to said frame, power-transmitting meansfor actuating said arbor, comprising a plurality of fixed pulleys, amovablepulley, an arbor pulley, a belt passing over said pulleys, meansfor shifting the movable pulley toward and from the arbor pulley, andmeans for shifting the angular position of said movable pulley withrespect to one or more of said fixed pulleys.

5. In a machine of the class described, the combination with a frame, anarbor adjust ably mounted in said frame so that its position may beadjusted with respect to said frame, power-transmitting means foractuating said arbor, comprising a plurality of fixed pulleys, a movablepulley, an arbor pulley, a belt passing over said pulleys, a

combination with a frame, an arbor mounted 1n sald frame so that itsposltion may be shifted with respect to said frame, powertransmlttlngmeans for actuating said arbor, said means comprising a plurality offixed pulleys, a movable pulley, an arbor pulley, a belt passing oversaid pulleys, and adjustable means responsive to the tension of saidbelt for automatically regulating the tension thereof regardless of theposition of said arbor pulley, and separate means for shifting theangular position of said movable pulley with respect to said fixedpulleys.

. 7 In a machine of the class described, the combination with a frame,an arbor, means for shifting the position of said arbor angularly withrespect to said frame, powertransmitting means for actuating said arbor,said means comprising a plurality of fixed pulleys, a movable pulleyhaving a substantially cylindrical periphery, an arbor pulley, a beltpassing over said pulleys, and automatically adjustable means forshifting said movable pulley relatively to said arbor pulley.

8. In a machine of the class described, the combination with a frame, anarbor adjustably mounted in said frame and adapted to be adjustedangularly with respect to said frame, power transmitting means foractuating said arbor comprising a plurality of fixed pulleys, a movablepulley having a substantially cylindrical periphery, an arbor pulley, abelt passing over said pulleys, and automatically adjustablespring-controlled means for shifting said movable pulley relatively tosaid arbor pulley.

9. In a machine of the class described, a frame, an arbor adjustablymounted in said frame so that its position may be shifted, powertransmitting means for actuating said arbor, said means comprising a plurality of fixed pulleys, a movable pulley, an arbor pulley, a beltpassing over said pulleys, automatically adjustable spring-controlledmeans for shifting the position of said movable pulley to and from saidarbor pulley, and means for adjusting the angular position of saidmovable pulley with respect to one of said fixed pulleys.

10. In a machine of the class described, the combination with a frame,an arbor adustably mounted in said frame so that its position may beshifted, a support for carryingsaid arbor means-for varying the verticalposition of said support, and means including a belt and a'movablepulley over 5 Which said belt passes, for actuating said arbor and forregulating the tension of said belt regardless-of the changed positionof said arbor, and separate means for shifting the position of saidpulley.

Signed by us at Benton Harbor, Miehi- 10 gan, this 6th day of May, 1910.

LARS L. FILSTRUP. EDDIE O. FILSTRUP.

Witnesses:

HUMPHREY S. GRAY, SUZANNE U. KELLEY.

' Copies of this patent may be obtained for five cents each, byaddressing the-Commissioner 0t Iatents;

' Washington, D. 0."

